scholarly journals Evaluation of the mechanical degradation of carbonate aggregate by rock strength tests

2019 ◽  
Vol 11 (1) ◽  
pp. 121-134 ◽  
Author(s):  
Mojtaba Kamani ◽  
Rassoul Ajalloeian
Keyword(s):  
Rock Strength ◽  
Mechanical Degradation ◽  
Carbonate Aggregate ◽  
Strength Tests

Discuss on Highly Weathered Metamorphic Fillers as Soft Stone Fillers

2010 ◽  
Vol 168-170 ◽  
pp. 264-269
Author(s):  
Ling Yun Yang ◽  
Feng Xue ◽  
Jun Huang ◽  
Chao Qun Hou
Keyword(s):  
Rock Strength ◽  
Highway Construction ◽  
Evaluation Criteria ◽  
Rock Structure ◽  
Strength Tests

In order to discuss on highly weathered metamorphic fillers as soft stone fillers，firstly the CBR tests for analysis on viability as embankment filler are conducted on three different highly weathered metamorphic fillers. Secondly the rock strength tests and particle broken tests are processed to study on how weathered degree and rock structure have an effect on them. Based on the above conclusions, evaluation criteria are proposed that have certain guidance and reference on mountainous highway construction.

scholarly journals Mechanical Degradation of Different Classes of Composite Resins Aged in Water, Air, and Oil

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Weber Adad Ricci ◽  
Priscila Alfano ◽  
Saulo Pamato ◽  
Carlos Alberto dos Santos Cruz ◽  
Jefferson Ricardo Pereira
Keyword(s):  
Flexural Strength ◽  
Storage Time ◽  
Composite Resin ◽  
Composite Resins ◽  
Mechanical Degradation ◽  
Hardness Testing ◽  
Significant Deterioration ◽  
Strength Tests ◽  
Group A ◽  
And Storage

A significant deterioration of the properties can drastically compromise the survival rate of restorative materials. The aim of this study was to assess flexural strength and hardness of three composite classes: hybrid composite resin (HCR), nanoparticulate composite resin (NCR), and silorane-based composite resin (SBCR). One hundred specimens were prepared for hardness testing by using a split metallic mold measuring 10 mm in diameter and 2 mm deep. Twenty specimens were prepared for each restorative material, randomly assigned for storage in air, distilled water, or mineral oil. After intervals of 24 hours, 30, 60, 90, and 120 days, hardness and flexural strength tests were initially compared in two levels: “storage medium” and “time” within each material group. A two-way analysis of variance was performed (p<0.05) on the variables “material” and “storage time” (p<0.05). The HCR showed to be stable with regard to the evaluation of flexural strength and hardness (p<0.05). A significant reduction occurs for the NCR in comparison to the other groups (p<0.05). The NCR presented the lowest values of hardness and flexural strength kept on water over time. The characteristics of material showed a strong influence on the decrease of the mechanical properties analyzed.

Contrasting underlying mechanisms of different barrier coating types

TAPPI Journal ◽  
2018 ◽  
Vol 17 (01) ◽  
pp. 31-37
Author(s):  
Bryan McCulloch ◽  
John Roper ◽  
Kaitlin Rosen
Keyword(s):  
Food Packaging ◽  
Underlying Mechanism ◽  
Consumer Products ◽  
Mechanical Degradation ◽  
Design Rules ◽  
Barrier Coatings ◽  
Barrier Materials ◽  
Barrier Coating ◽  
Coating Type ◽  
Underlying Mechanisms

Barrier coatings are used in applications including food packaging, dry goods, and consumer products to prevent transport of different compounds either through or into paper and paperboard substrates. These coatings are useful in packaging to contain active ingredients, such as fragrances, or to protect contents from detrimental substances, such as oxygen, water, grease, or other chemicals of concern. They also are used to prevent visual changes or mechanical degradation that might occur if the paper becomes saturated. The performance and underlying mechanism depends on the barrier coating type and, in particular, on whether the barrier coating is designed to prevent diffusive or capillary transport. Estimates on the basis of fundamental transport phenomena and data from a broad screening of different barrier materials can be used to understand the limits of various approaches to construct barrier coatings. These estimates also can be used to create basic design rules for general classes of barrier coatings.

NONCONTACT MEASUREMENTS OF WING BOX DEFORMATION DURING STRENGTH TESTS BY VIDEOGRAMMETRY METHOD

2017 ◽  
Vol 48 (8) ◽  
pp. 751-760
Author(s):  
Vladimir Petrovich Kulesh ◽  
K. A. Kuruliuk ◽  
M. A. Fedotov
Keyword(s):  
Strength Tests ◽  
Noncontact Measurements ◽  
Wing Box

Effect of Polymer, Road Surface, and Driving Conditions on Wear Surface Characteristics of Tire Treads

1973 ◽  
Vol 1 (4) ◽  
pp. 354-362 ◽  
Author(s):  
F. R. Martin ◽  
P. H. Biddison
Keyword(s):  
Wear Surface ◽  
Surface Characteristics ◽  
Road Surface ◽  
The Other ◽  
Mechanical Degradation ◽  
Textured Surface ◽  
Test Track ◽  
Driving Conditions ◽  
Styrene Butadiene ◽  
Cylindrical Particles

Abstract Treads made with emulsion styrene-butadiene copolymer (SBR), solution SBR, polybutadiene (BR), and a 60/40 emulsion SBR/BR mixture were built as four-way tread sections on G78-15 belted bias tires, which were driven over both concrete and gravel-textured highways and on a small, circular, concrete test track. The tires were front mounted. When driven on concrete highway, all except the BR tread had either crumbled- or liquid-appearing surfaces, thought to have been formed by mechanical degradation or fatigue. When cornered on concrete, these materials formed small cylindrical particles or rolls. The BR tread had a smooth, granular-textured surface when driven on concrete highway and a ridge or sawtooth abrasion pattern when cornered on concrete. All the materials appeared rough and torn when run on gravel-textured highway. The differences in wear surface formed on BR tread and the other three are thought to be due primarily to the relatively high resilience of BR.

Study of Bismuth Telluride Crystal Strength

2019 ◽  
pp. 1-8
Author(s):  
A. A. Gorbatovskiy
Keyword(s):  
Tensile Strength ◽  
Bismuth Telluride ◽  
Elasticity Modulus ◽  
Testing Machine ◽  
Bend Testing ◽  
Instron Testing Machine ◽  
Measurement Results ◽  
Strength Tests ◽  
Semiconductor Properties

The article presents results of strength tests of bismuth telluride prismatic samples obtained by growing crystals. These crystals have semiconductor properties and are used in the heat machines, the run-ability of which largely depends on the strength of crystals. Data available in the literature are significantly different from each other. It has been shown that, the most consistent strength tests results are obtained in case of bend testing. The measurement results of the elasticity modulus and tensile strength are given. For tests, an INSTRON testing machine with maximum direct stress of the 1000 H was used.

Sign in / Sign up

Export Citation Format

Share Document